Some time ago I made a question asking How to install Ubuntu on a USB external Hard Drive without losing its external storage ability. They've closed my question and sent to this one.
Today I did the steps "Installing Ubuntu to a removable USB drive with Virtual Box". But When I try to use the Hard Drive as a normal USB Stick, the system doesn't recognize it. I'm using Windows, the Windows detects the drive. Although the bootable Ubuntu works fine, the windows doesn't recognize as hard drive unit. Does it really lead for what I wanted to?